Statistics for occurrence #1 of “Washington City” in chapter 1.32 of Southern Historical Society Papers, Volume 34.:

... Gen. George B. Mc-Clellan, as commander-in-chief of Ohio volunteers, with his headquarters at Cincinnati, and Gen. Winfield Scott, as commander-in-chief of the Federal army, with his headquarters at Washington City . (See War of Rebellion, Vol. LI., Series I., Part I., Supplement). On the 23d day of April, 1861, from Columbus, Ohio (see page 333 of above history), General McClellan writes General Sc...
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Washington City (Missouri, United States) 0 0 0 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.